If It's Diesel, We Do It.

DIESEL SPECIALISTS, LTD

Serving the Houston area since 1983.

If It's Diesel, We Do It.

Heavy Duty Truck Repair in Houston, TX

Your trucks move your business and when one goes down, every idle hour has a real cost. Diesel Specialists, Ltd has been Houston's trusted heavy duty truck repair shop since 1983, providing commercial truck engine repair, diagnostics, and overhauls for owner-operators, fleet operators, and trucking companies across Greater Houston and the Texas Gulf Coast. We handle the engine work that keeps Class 6–8 diesels running hard and running right.

Call (281) 446-1230 for a Diagnostic Appointment

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Heavy Duty Truck Engine Problems We Fix

Hard starting or no-start in cold or hot weather conditions
Power loss, derating, or limp mode activation under load
Excessive exhaust smoke — black (over-fueling), white (coolant/cold), blue (oil)
Engine overheating, especially under highway or loaded conditions
Abnormal engine noise — knocking, ticking, or metallic sounds
High oil consumption or oil contamination
DPF, EGR, or SCR system faults generating warning lights
Check engine / MIL illuminated with fault codes
Turbocharger boost issues — loss of power or over-boost conditions
Fuel economy declines not explained by load or route changes

Our Heavy-Duty Truck Repair Services

Diesel Truck Engine Diagnostics

We start with a thorough diagnostic before recommending any repair. Our technicians use professional-grade scan tools for all major engine platforms, combined with compression testing, fuel pressure analysis, and visual inspection to identify the root cause of the problem not just the symptom.

Fuel System Service

Injector service and replacement
Fuel pump diagnosis and repair
Turbocharger replacement and rebuild
Cylinder head repair and replacement
Gasket and seal packages head, valve cover, oil pan
Cooling system repair water pumps, thermostats, radiator hose service
EGR valve and cooler service
DPF cleaning and emissions system repair

Heavy Duty Truck Engine Overhaul & Rebuild

When a truck engine reaches the end of its repair cycle, our in-shop engine rebuild capability restores it to reliable service at a fraction of the cost of a new or remanufactured engine. We perform both in-frame and out-of-frame rebuilds with full in-house machine shop support.

Roadside & Field Repair

When your truck breaks down in the Houston metro area, our field service technicians can respond to perform on-site diagnostics and repairs. When a field repair is not feasible, we coordinate transport and prioritize your truck in our shop.

Truck Engine Brands We Service

Cummins — ISX, X15, ISB, ISM, and ISC seriesBullet List 2
Detroit Diesel — DD13, DD15, DD16, Series 60
Caterpillar — C7, C10, C12, C13, C15
Paccar MX — MX-11, MX-13 (select service)
International MaxxForce (select service)
Isuzu — 4HK1, 6HK1 for medium duty
John Deere PowerTech — medium and heavy-duty truck engines

Fleet Truck Repair & Maintenance Programs

For fleet operators managing multiple trucks, consistent preventive maintenance and fast turnaround on breakdowns is essential to profitability. We work with fleet maintenance managers and procurement teams to establish reliable service agreements that keep vehicles running and minimize unplanned downtime. Call us to discuss fleet service options.

Why Choose Diesel Specialists for Generator Repair?

40+

Years in Service

4.3★

100+ Reviews

1983

Founded in Houston

12+

Brands Serviced

In-house machine shop for rebuild and overhaul work without outsourcing delays
Clear estimates before work starts — no surprises on your invoice
Root-cause diagnosis — we fix the problem, not just the warning light
Clear, documented repair findings and recommendations on every job

Customer Reviews

★★★★★

"Whole crew at diesel specialist are amazing go above and beyond!! Get service especially Miriam always so sweet and kind and Debbie and Delbert as will to help bravo!!!"

Alfredo Ortiz

★★★★★

"Great experience with Diesel Specialist LTD. Everyone was really nice, professional, and helpful. They worked fast and didn’t waste time."

Maricela Razo

★★★★★

"I had ordered a few parts that my dad needed and whenever I had to pick them up, Miriam was there and let me just say, she was VERY helpful, attentive and super friendly!"

Julissa Garcia

★★★★★

"Absolutely amazing people. They go above and beyond! Thank you Diesel Specialist"

D Bolden

★★★★★

"I do a lot of business with diesel specialist and they always put you first and have the kindest front desk personal"

Nick Foster

★★★★★

"Ana is the greatest when it comes to any of our needs!! Diesel Specialists is the go to place for any Diesel needs. We drive all the way from Beaumont area to have our diesel needs taken care of!"

Dean Thompson

★★★★★

"They have extensive knowledge and offer all their expertise to help you with whatever you need; they have good parts"

Julio Maldonado

★★★★★

"Mr. Leo IV has always gone above and beyond, Diesel specialists is the place to go!!"

Charles Skelly

Frequently Asked Questions (FAQs)

Yes. We service Class 6 through Class 8 diesel engines, including semi-trucks, dump trucks, flatbeds, vocational trucks, and medium duty commercial vehicles.

Minor repairs and diagnostics may be completed same-day or next-day. Major repairs and overhauls can take several days to a few weeks depending on parts availability and work scope. We communicate timeline clearly at the estimate stage.

Yes. Diesel Specialists provides Annual DOT Inspections for commercial vehicles. See our Annual DOT Inspection page for details.

We can coordinate towing or provide field service in the Greater Houston area to assess whether the truck can be safely transported or repaired on-site. Call us and we'll work through the logistics with you.